jar - Eclipse 插件依赖 jar 无法从引用的 jar 中找到类

Question

我目前正在将一个大型程序从 Java 1.6 更新到 1.8。我也为此切换到更新版本的 Eclipse，并且不得不与很多工作区问题作斗争。

无论如何，我目前被困在无法在 lauch 实例化类的项目之一上，因为项目插件依赖项中的 jar 似乎无法从项目引用的库中的 jar 中找到类。

尝试启动项目时，我得到以下堆栈跟踪：

!ENTRY org.eclipse.osgi 4 0 2019-02-14 09:03:41.421
!MESSAGE Application error
!STACK 1
org.eclipse.core.runtime.CoreException: Plug-in "at.jku.mevss.product" was unable to instantiate class "at.jku.mevss.product.application.DistributionServerApplication".
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:200)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:194)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:934)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:246)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:63)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:391)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:246)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:595)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1501)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1474)
Caused by: java.lang.NoClassDefFoundError: org/eclipse/ui/application/WorkbenchAdvisor
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
    at java.lang.Class.getConstructor0(Class.java:3075)
    at java.lang.Class.newInstance(Class.java:412)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:190)
    ... 16 more
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.ui.workbench (116).
    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:126)
    at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:557)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:331)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
    at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:39)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:469)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:414)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:153)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 21 more
Caused by: org.osgi.framework.BundleException: Error starting module.
    at org.eclipse.osgi.container.Module.doStart(Module.java:593)
    at org.eclipse.osgi.container.Module.start(Module.java:452)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:471)
    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:117)
    ... 30 more
Caused by: java.lang.NoClassDefFoundError: org/eclipse/swt/SWTError
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
    at java.lang.Class.getConstructor0(Class.java:3075)
    at java.lang.Class.newInstance(Class.java:412)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.loadBundleActivator(BundleContextImpl.java:766)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:719)
    at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1005)
    at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:357)
    at org.eclipse.osgi.container.Module.doStart(Module.java:584)
    ... 33 more
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.SWTError cannot be found by org.eclipse.ui.workbench_3.112.0.v20180906-1121
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:511)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:414)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:153)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 42 more
An error has occurred. See the log file
D:\RCPClients\MCC\.metadata\.log.

根据我在产品项目中的理解，workbench.jar 无法从 org.eclipes.swt.xxx.jar 中找到 SWTError 类。我已经确认这两个 jar 都包含在引用中，尽管 workbench 是一个插件依赖项，而 org.eclipes.swt.xxx.jar 只是一个引用库。

我是否可能必须在其他地方包含 org.eclipes.swt.xxx.jar，以便 workbench.jar 可以正确访问它？相同的代码在 Java 1.6 下完全正常，但我想这可能是工作区设置中的一个问题，而不是尝试切换到 1.8 时产生的问题。

提前致谢！

标签： jareclipse-pluginclassnotfoundexception